Use MSAA_Role directly from BrowserAccessibility.

content/browser/accessibility/browser_accessibility_com_win.h

Index: content/browser/accessibility/browser_accessibility_com_win.h
diff --git a/content/browser/accessibility/browser_accessibility_com_win.h b/content/browser/accessibility/browser_accessibility_com_win.h
index f385050116f72137d7b1ee7a4444fe5d737ffcb3..911459182fc5d990bd5f8ca5ceaee4d7d4ea97ae 100644
--- a/content/browser/accessibility/browser_accessibility_com_win.h
+++ b/content/browser/accessibility/browser_accessibility_com_win.h
@@ -727,7 +727,6 @@ class __declspec(uuid("562072fe-3390-43b1-9e2c-dd4118f5ac79"))
 
  private:
   // Private accessors.
-  int32_t ia_role() const { return win_attributes_->ia_role; }
   int32_t ia2_role() const { return win_attributes_->ia2_role; }
   int32_t ia2_state() const { return win_attributes_->ia2_state; }
   const std::vector<base::string16>& ia2_attributes() const {
@@ -926,9 +925,6 @@ class __declspec(uuid("562072fe-3390-43b1-9e2c-dd4118f5ac79"))
 
   // Fire a Windows-specific accessibility event notification on this node.
   void FireNativeEvent(LONG win_event_type) const;
-
-  static bool IsInTreeGrid(const BrowserAccessibility* item);
-
   struct WinAttributes {
     WinAttributes();
     ~WinAttributes();